He is a Corporal of the Imperial Japanese Army and a C-class vampire who has lived since before the Edo period.

Infected sometime during the Azuchi-Momoyama period while age 14-16. Suwa has little memory of being human and chose his own name following his infection. He named himself Suwa because his only memories left as a human was when he was playing by the Suwa shrine as a child. Suwa lived through the wild era and has to suppress his instincts using a mask that hides the odour of blood. He has eleven stigmata on his body and is known as the vampire who hates vampires.